As a big fan of HuniePop myself, I'd like to propose another version of the backgrounds of the game.
My idea was not to compress them in width to make them fit SDT, but to cut them in 3 parts: Left, Middle & Right. I did this for every variant of each background (yeah, I know...).

I also launched a thread to try and recreate all the girls here. At some point, the link above will be dead because I'll have added all those backgrounds in a complete package, but for now, you're welcome to download them all in this separate .zip